On the 19th of July 2016, starting from 8:00 AM CEST (EU server) and 0:00 PDT (NA server), the Open Beta servers will not be available for four hours (until approximately 12:00 CEST - 4:00 AM PDT) due to the application of Hotfix 0.16.2344.4.
LIST OF HOTFIX 0.16.2344.4 CHANGES
Fixed an issue causing the game servers to crash
Improved the game stability
Please note that the maintenance can be extended beyond the abovementioned timeframe. We apologize for the inconvenience.